Combined steam generator and oil burner



Deco 17, 1935.

W. c, MASON COMBINED STEAM GENERATOR AND OIL BURNER 3 $heets-Sheet 1 Filed Nov. 25, 1931 //v vsvv TOR M7024? C: M4501? A 7' roe/v5 Y6 1'7, 1935c w. c. MASON 2,024,467

COMBINED STEAM GENERATOR AND OIL BURNER Filed NOV. 25, 1931 3 Sheets-Sheet 2 E JAM?" //V vs raw f7 6. 7 /////d/77 6T Mafia/7 A TTORNE Y8 Dec. 17, 1935. w, c. MASON COMBINED STEAM GENERATOR AND OIL BURNER Filed Nov. 25, 1931 3 Sheets-Sheet 3 Mmmmm HUI! /NVN7'0I? l4 ////'am 6. Mayo/7 Arroxwvs Y6 Patented Dec. 17, 1935 UNITED STATES PATENT OFFICE COMBINED STEAM GENERATOR AND OIL BURNER 18 Claims.

One of the objects of my invention is the provision oi a generator in which the liquid is heated and steam generated initially by spaced electrodes and the steam pressure maintained sub stantially constant by varying the active surface between the electrodes. I

Another object of my invention is the provision of novel means for the regulation of the liquid level relatively to the electrodes.

A further object of my invention is the provision of means for utilizing and controlling the steam from the generator for the purpose of atomizing oil for an oil burner.

A still further object of my invention is the provision of novel means for controlling the supof liquid to the generator.

Other objects of my invention will appear in the specification and will be particularly pointed out in the claims.

My invention will best be understood by reference to the accompanying drawings in which I have illustrated certain embodiments thereof and in which Fig. 1 is a vertical sectional view through a generator embodying my invention;

Fig. 2 is a side view illustrating the steam generator of Fig. 1 diagrammatically and combined with a combustion furnace and an oil burner associated therewith;

Fig. 3 is a fragmentary side view illustrating a switch coacting with the steam generator for controlling an ignition circuit for the oil burner;

Fig. 4 is a diagram of connections;

Fig. 5 is a sectional view illustrating a modified form of control for the atomizing steam;

Fig. 6 is a side View, partially broken away, of a modified and preferred form of my invention; and

Fig. 7 is a sectional view similar to Fig. 6 illustrating a further modification.

Like reference characters indicate like parts throughout the drawings.

Referring now to the drawings and first to the embodiment of my invention illustrated in Figs. 1 to a, It indicates generally a steam generator comprising a boiler shell I I provided with chambers i2 and IS, the portions of the shell preferably being partially cylindrical in form. Within the chamber l2 are located two spaced electrodes, a stationary electrode I4 and a movable electrode These electrodes are formed of any suitable material, but are preferably formed of carbon or graphite. The stationary electrode I4 is preferably secured to the frame III of the boiler shell as by screws I6. The movable electrode is preferably provided with outwardly extending members I I of insulating material for maintaining the electrodes in properly spaced relation, and a member I8 which is preferably in the form of a cylinder and may be formed of porcelain or the 5 like, interposed between the bottom portion of the movable electrode and the bottom portion of the cup-shaped recess in the stationary electrode. The chamber I2 is preferably enclosed by an insulating casing 19 within the shell II for preventing electrolysis between the electrodes and the metallic shell. The insulating casing I9 is provided at its lower portion with an opening 20 which affords communication between the two chambers and is also provided with an opening 2| through which passes a control member 22 which will be more fully described hereinafter.

In accordance with my invention, means are provided for maintaining the steam pressure within the generator substantially constant. The boiler shell I I in the embodiment illustrated in Fig. 1 is provided at the upper end with a conical portion 23 and a contracted cylindrical portion 24, the contracted portion which is integral with the conical portion preferably being separate from the main shell to which it may be connected as by screw threads, as indicated at 23L The top plate 25 of the cylindrical portion is provided with a screw threaded opening 26 in which is received a screw threaded member 21. The member 2'! is provided with an opening 28 through which extends a sleeve 29, formed of insulating material.

A bellows 30 is located within the cylindrical portion 24 of the generator shell, the upper end of the bellows being seated against the plate 25, its movable end being closed by a bottom plate 3! forming a fluid-tight joint with the collapsible portion of the bellows. The member 21 is provided with a recess 32 surrounding the sleeve 29, and a coil spring 33 is interposed between the member 2! and the bottom plate 3| of the bellows, the upper end of the spring being received within the recess 32.

A rod or stem 34 is secured at its lower end to the movable electrode I5 as by being screwed into a recess therein as at 35. The upper portion of the stem 34 passes through the sleeve 29 and forms a terminal for the movable electrode I5, the upper end of the stem preferably being screw threaded in a usual manner and provided with clamping nuts 36 for terminal connection. The stationary electrode I4 is grounded to the casing which is provided with a terminal connection 59. The member 21 forms a convenient 55 means for adjusting the force or pressure necessary for operating the bellows. The bottom plate 3! of the bellows is provided with an opening surrounding the stem 34 in which is received an insulating washer 31. The pipe 38 for supplying steam for atomizing the oil is connected into an opening 39 (Fig. 2) in the upper portion of the shell surrounding the chamber l3. A baffle 40 is seated against the bottom of the plate 3| of the bellows, and is suitably spaced from the inner electrode l5 by a spacing post 4|.

The boiler shell surrounding the chamber l3 in the embodiment illustrated is substantially the same as that surrounding the chamber l2 and is provided with a similar conically shaped portion 23' and cylindrical portion 24' which, however, in this case is closed at the top to form a steam dome. Within the chamber I3 is located a float 42 preferably provided on its lower side with a downwardly projecting bracket 43, a stem 44 passing through an opening 45 in the bracket and also passing through the float as indicated, the stem preferably extending upwardly above the float.

A liquid supply pipe 46 is connected into an opening 41 in the lower plate of the chamber l3, and is provided with a contracted portion 48 forming a valve seat and provided with an opening 49, a ball valve 50 being attached to the lower end of the stem 44 preferably by a contracted connecting member 5|.

The member 22 which passes through the opening 2| is provided at one end with a hook 52 which is received in an eye member 53 attached to the baffle 4|]. The opposite end of the member 22 is loosely connected to a screw member 54 received in the top plate of the shell and accessible through a recess 55. The intermediate portion of the member 22 surrounds the stem 44, and a spring 56 is interposed between the member 22 and a head 51.

In the diagrammatic view illustrated in Fig. 2, the chambers enclosed by the shells I l are shown as physically distinct and connected by pipes merely for clearness of illustration.

The conductors for the current supplied to the electrodes are indicated at 58 and are connected' to the stem 34 and to a ground as at 59 respectively.

A lever 60 is pivoted as at 6| on a post 62 mounted on the upper end of the boiler shell, one end of the lever 60 being provided with yokes 63, (only one of which is illustrated in Fig. 2) engaging pins 64 on the sleeve 29. The free end of the lever 60 is provided with a baflie 65 which is interposed, when the generator is not in operation, between the orifice 66 of the atomizing head of the steam pipe and the end 61 of an oil pipe 68 which is connected to a suitable reservoir 69. The oil burner is associated with a combustion furnace indicated at 10, a wall of which adjacent the oil burner is provided with an opening H.

A switch indicated generally at 12 (see Figs. 3 and 4) controls an ignition circuit for the oil. An arm 13 is mounted on the upper end of the stem 34 and is provided at its end with a contact member 74. In the position indicated in Fig. 3, the contact member engages only the lower one of two yielding contact members 15. In this position, the ignition circuit, including the conductors I6, is open. As the stem 34 further rises, the contact member 14 will momentarily engage both the upper and lower contact springs 15 thereby closing the ignition circuit and igniting the oil spray. In the embodiment of my invention illustrated in Fig. 4, the ignition circuit includes the secondary 1'! of a transformer indicated generally at E8, the primary 19, in which is included the switch 12, being connected to line wires 83 and 8|. A switch 83 (Fig. 4), which may be manually operated, is also preferably included in one of the connections leading from a line conductor to one of the electrodes.

In case the oil burner is located comparatively near the generator, I prefer the arrangement illustrated in Fig. 1, for controlling the atomization by the steam.

In Fig. 5, I have illustrated a modified form of control which is particularly applicable where the burner is located at some distance from the steam generator. In this embodiment of my invention, a separate bellows 30a is secured to the shell Ila of the generator and is preferably enclosed in a housing 24a preferably secured to said shell. The expansion of the bellows is resisted by a spring 33a seated against the end of the bellows and in a member lEi'i which is adjustable by a screwthreaded member I88. A stem or rod 34a engages the end of the bellows and is connected to a yoke 558 which surrounds the stem 34 and the insulating sleeve 34 i. A valve stem 44a is mounted in an opening in the yoke I09 and is provided at its free end with a valve 55a which seats against the inner end of the steam atomizing pipe 38a. A spring 3312 engages a collar H5 and the yoke.

The inner end of the valve stem 44a is provided with an adjustable nut 44b which permits the yoke member I89 to move to the right as viewed l in Fig. 5 before engaging the nut 44b and thereby releasing the valve 550. from its valve seat. The parts then assume an equilibrium, the valve being open suihciently to permit the same amount of steam to escape that is generated. It will be understood that a rough adjustment may be secured by the adjustable nut 44?) and a finer adjustment by the screw I08 which is accessiblefrom the exterior of the device.

The operation of the device embodying my invention will readily be understood from the foregoing description and is as follows.

Assuming that no liquid is in the generator, the float 42 will depress the ball valve 58 from its seat permitting liquid to flow into the generator until the float moves the ball valve to a closed position. When the valve closes, the liquid is preferably substantially at the level of the upper edge of the stationary electrode. The circuit in which the electrodes l4 and F5 are included is then closed by the switch 83, and the passage of current between the electrodes heats the liquid and quickly generates steam.

As pressure begins to build up within the generator, the bellows 3i) begins to collapse; in other words the lower plate 3| of the bellows is moved upwardly thereby forcing upwardly the sleeve 29 and the stem 34 which is secured thereto, thereby raising the inner movable eiectrode i5 and decreasing the amount of liquid between the electrodes and correspondingly decreasing the ccnducting surfaces between the electrodes and the steam generated by the current. At the same time, the lifting of the electrode [5 out of the liquid lowers the liquid level. The lowering of the liquid level causes the float to fall until it unseats the ball valve 56 and water again flows into the generator. The liquid level then rises, preferably until it approximately reaches the upper edge of the stationary electrode. The inner electrode is now partially lifted from its position within the stationary electrode and to a point where sufficient steam is generated to compensate for the loss of steam passing through the steam pipe 38. At the same time the float is so adjusted that the valve is slightly unseated permitting sufficient liquid to flow into the generator to compensate for the loss of liquid due to steam generation. The device thus maintains the steam pressure within the generator substantially constant and a predetermined steam pressure may be secured by regulation of the screw member 54 to which one end of the arm 52 is pivoted. It is to be understood that the adjustment of the members 27, 54 and 51 must be coordinated with each other.

As soon as sufficient pressure, for example three or four pounds, has been reached in the generator, the upward movement of the stem 34 rocks the lever arm 69 about the pivot BI, thereby withdrawing the bafile from its normal position between the orifice 66 of the steam pipe 38 and the end Ill of the oil supply pipe 68, thereby spraying oil into the furnace. At the same time the upward movement of the stem 34 closes the switch 82 in the manner above described and the oil spray is ignited. As soon as the pressure is slightly increased the ignition circuit is opened.

In Fig. 6 I have shown a modified form of my invention in which the generator is enclosed in a single generally cylindrical shell H2 comprising a lower cylindrical portion H3, which encloses the bellows 30I, an intermediate portion H l of smaller diameter than the portion H3 and an upper cylindrical portion H5 of smaller diameter than the intermediate portion. A downward extension H6 of the shell, and which is illustrated as of the same diameter as the upper section H5, is enclosed in the intermediate portion H4 and in turn encloses the stationary electrode I4 and the inner movable electrode I5, which is spaced from the outer electrode in the same manner as described in connection with Fig. 1.

The stationary electrode is secured to the lower plate II'I of the extension H6 to which it is grounded as in Fig. 1. The inner electrode is carried by the stem 34l, the same as in Fig. l, and the stem is secured to an insulating sleeve 84 which passes through a packing gland indicated generally at 85. The gland comprises a lug 86 formed with a recess 01 in which packing material 88 is received, and when the gland plate 89 forced downwardly by the screws 90, the packing material grips the insulating material 84 and retains the same in position. A bafile 9| is interposed between the lower end of the insulating member 84 and an insulating sleeve 92 between the baffle and the electrode I5. The baffle 9I serves to prevent water which may be thrown upwardly in the form of a spray, because of the hubbles rising between the electrodes, from reaching the steam atomizing pipe 38.

In this embodiment of my invention the inner electrode is manually movable instead of being movable in response to the steam pressure within the generator, and enables the operator to adjust one electrode relatively to the other. It is well understood that the conductivity of water varies in accordance with its acidity, alkalinity and other factors, and the operator can so adjust the electrodes as to secure a substantially uniform conductivity between them. The float MI, in the embodiment of my invention illustrated in Fig. 6, surrounds the shell I I6 and is connected preferably by two links 93, only one of which is illustrated in the drawings, to the outer ends of arms 94 pivoted at on a tubular member 95 secured to an upwardly extending lug 91 on the bottom plate 302 of the bellows. It will be noted that the outer ends of the arms 95 are loosely received between the nuts 98 on the stem 93. The inner ends of each arm 94 are rec ed between a head 99 and a plate or collar 5% o needle valve stem IOI which cooperates with a seat I02 formed in the base member 392 to the feed supply pipe MI is connected.

In this embodiment of my invention, the plate Ill is provided with openings I03 while the up 1 per portion of the shell or casing H6 is provided with openings I04 which afford communication between the chamber above the electrodes and the space within the intermediate portion Eidof the shell which is above the float 42L An insua lating casing I9, similar to that shown in Fig. l is enclosed within the portions I I5 and I it of the shell to prevent electrolysis.

In the embodiment of my invention illustrated in Fig. 6 one or more tubes I05 are connected to the upper portion I I5 of the shell and to the lower part of the intermediate portion I94, and each tube is provided with a curved portion h'lfi which extends into the heated zone of the burner. When combustion in the furnace takes place, i then the circulating tubes I05 generate a sunleient amount of steam to force the bellows down far enough to carry the water level below the electrodes so that normally the steam is produced in the generator by heat in the combustion fur- 3 nace which is more economical than where the heat is produced electrically during the normal operation. If, in case of failure of power or for other reasons the generation of current fails, th steam may be generated initially betweei electrodes by the application of external to the tubes I05. It is to be understood that when the bellows is expanded and lowers the water level about the electrodes, the volume of water in the generator remains constant save for that portion which is expelled as steam through the outlet Hence, inasmuch as the float for the water admission valve operates said valve in response to variations in the water level in the generator, the

operation thereof is also further controlled by the volume of water contained in the generator and sylphon bellows as hereinbefore described.

It will be understood that a baffle membe normally located between the orifice of the steam atomizing pipe and the end of the oil pipe and operates in the same manner as that described in connection with Fig. 2. It will, of course, also be understood that the lever arm 65 is connected to the bellows 30I. The connections and gen eral arrangement of parts could readily be by anyone skilled in the art and, therefore, for clearness of illustration have not been shown.

The operation of the device illustrated in Fig. 6 is as follows:

Assuming that liquid in the generator is at about the level of the upper edge of the outer electrode I4, the float pulls the outer ends or the arms 94 upwardly thereby depressing the needle valve and closing the valve. Now when r the switch 83 is closed, current is turned on and steam is generated. As the steam pressure builds up, the bottom plate 302 of the bellows is depressed thereby lowering the water level in the generator and carrying the water below the 7 upper edges of the electrodes and decreasing the current passing between the electrodes. The

escape of steam and the attendant loss of water in the chamber causes the float 42I to move downwardiy due to the fall of water level and the float opens the needle valve and again admits water to the generator. The parts are preferably so adjusted that normally the float is submerged slightly more than it would be due to its own buoyancy.

In the embodiment of my invention illustrated in Fig. '7, the resistance between the electrodes and correspondingly the amount of steam generated therebetween is regulated by the movement of an insulating shield into and out of position between the active surfaces of the two electrodes. A bellows 38b, or other expansible member, is mounted on the cap or cover which closes the upper section H5 of the shell of the generator. The upper end of the bellows is closed at the top, and the movement thereof is resisted by a spring 33b one end of which is seated against the upper end of the bellows and the other end of which engages the lower end of an adjustable member, preferably in the form of a screw 2141. A shield 26%) formed of insulating material and preferably cylindrical in form is located between the inner and outer electrodes hi and I5 and is adjustable vertically therebetween. A stationary plate 28! of insulating material is mounted in position within the stationary electrode and covers the bottom portion thereof to prevent the passage of current between the inner electrode and the bottom surface of the outer electrode. The upper portion of the shell IE3! is mechanically connected by links 282 passing upwardly on opposite sides of the sleeves 84 and t2 through suitable openings in the deflector 9i and are pivoted to the fork or yoke 263 on an arm 294 pivoted to a stem 205 connected to the bellows.

The operation of the modified form of my invention illustrated in Fig. '7 is substantially the same as the embodiment illustrated in Fig. 3 with the exception that a shield is raised and lowered by the bellows 38a instead of the water level being raised and lowered as in the case of Fig. 6, and the shield controls the amount of active surface between the electrodes and the rate of steam generation.

While I have illustrated my invention in connection with a single phase alternating current, it is to be understood that it is equally applicable to a direct current system or to a single phase three-wire system with a grounded neutral or a three-phase, four-wire Y connection or a threephase, three-wire delta connection. In the arrangement illustrated in Fig. l, I move one of the electrodes relatively to the other and relatively to the liquid level and thereby vary the amount of liquid contained between the two electrodes, while in Fig. 6, I accomplish the same result by varying the water level itself, and in Fig. 7 I also accomplish the same result by moving the shield.

While I have described my invention in its preferred embodiment it is to be understood that the words which I have used are words of description and not of limitation and that changes within the scope of the appended claims may be made without departing from the true scope and spirit of my invention in its broader aspects.

What I claim is:

1. In a steam generator, spaced electrodes forming a heating element located at least in part below the liquid level in said generator,and means comprising means operable in response to variations in the position of the liquid level in said generator and means responsive to the va- 5 per pressure therein for controlling the admission of liquid thereto.

2. In a steam generator, spaced electrodes forming a heating element located at least in part below the liquid level in said generator, and 10 means comprising means operable in response to variations in the position of the liquid level in said generator and means responsive to the vapor pressure therein for controlling the admission of liquid thereto; said pressure responsive 15 means being operable to vary the heat-generating capacity of said electrodes.

3. In a steam generator, spaced electrodes forming a heating element located at least in part below the liquid level in said generator, 20 means for controlling the admission of liquid to said generator, means responsive to the vapor pressure in said generator for varying the heatgenerating capacity of said electrodes and controlling said first mentioned means, and means 25 operable in accordance with variations in the position of the liquid level in said generator for further controlling said first mentioned means.

4. In a combined steam generator and fuel burner, means for electrically heating the liquid 30 in said generator, steam generating means comprising a conduit extending into the heated zone of said fuel burner and connected to different levels of said generator, and means responsive to the steam pressure within said generator for 35 opening the circuit of the electrical heating means, whereby the steam in said generator is then produced by said steam generating means exclusively.

5. In a combined steam generator and fuel 40 burner, an electric circuit, means included within said circuit for electrically heating the liquid in said generator, means for Varying the liquid level in said generator, means for supplying feed Wate to said generator, steam generating means com- 45 prising a conduit extending into the heated zone of said fuel burner and connected to different levels of said generator, said means having a steam generating capacity capable of producing in the steam generator steam pressure sufficient 50 to force the liquid level downwardly and thereby control the current to the electric heater.

6. In combination, a steam generator, electrically operated means for heating liquid there in, automatic means for maintaining substan- 5 tially constant pressure therein, a fluid fuel burner associated with said steam generator, and steam supply means communicating with said generator for atomizing the fuel for said burner.

7. In combination, a steam generator, elec- S0 trically operated means for heating liquid therein, automatic means for maintaining substantially constant pressure therein, a fluid fuel burner comprising a fuel supply pipe associated with said generator, and a steam pipe communicating G5 with said steam generator and leading to a point adjacent to the orifice of said fuel supply pipe.

8. In combination, .a steam generator, automatic means for maintaining substantially constant pressure therein, an oil burner comprising an oil supply pipe associated with said generator, a steam pipe communicating with said generator, and leading to a point adjacent to the orifice of said oil supply pipe for atomizing the oil for said burner, and means responsive to the steam pres- 75 sure in said generator for controlling the flow of steam through said steam pipe to the orifice of oil burner.

9. In combination, a steam generator, electrically operated means for heating the liquid therein, automatic means for maintaining substantially constant pressure therein, an oil burner comprising an oil supply pipe associated with said generator, a steam pipe communicating with said generator and leading to a point adjacent to the orifice of said oil supply pipe for atomizing the oil for said burner, means for normally deflecting the steam from the orifice of said pipe, and means responsive to the pressure in said generator for moving said deflector out of the path of the steam.

ii). In combination, a steam generator, electrically operated means for heating the liquid therein, automatic means for maintaining substantially constant pressure therein, an oil burner comprising an oil supply pipe associated with said generator, a steam pipe communicating with generator and leading to a point adjacent to the orifice of said oil supply pipe for atomizing the oil for said burner, and means responsive to the pressure in said generator for igniting the oil.

11. In a steam generator comprising electrical means for heating the liquid therein, means responsive to the vapor pressure in said generator 1' regulating the height of the liquid level relatively to said electrical heating means and means comprising a float for controlling the admission feed water to said generator; said pressure res onsive means and said feed water control means being movable together whereby said water control means is operable in response to: relative movements between said float and said pressure responsive means.

12. In a steam generator, an electric circuit, spaced electrodes located at least in part below the normal water level in said generator, a hollow expansible member communicating with said generator, a float flexibly connected to said expansible member", means responsive to the movement of said member for varying the position of the water level in said generator and thereby varying the conductivity between said electrodes and means responsive to the relative movement between said float and said expansible member for controlling the admission of feed Water to said generator.

13. A steam generator comprising, a water container, an electrical immersion heater therein, an expansion chamber communicating with said container below the water level therein, whereby water will be forced from said container into said chamber by steam pressure, thereby reducing the height or depth of water about the heater, a water supply for said generator and means responsive to variations in the water level in said container and responsive to variations in the volume of water in said container and expansion chamber for controlling the volume of water in said generator. 5

14. In a steam generator, means for heating the liquid therein, an expansion chamber communicating with the liquid in said generator and affording an auxiliary chamber in which a variable amount of liquid is received in accordance with the pressure in said generator, and means responsive to variations in the liquid level in said generator and to variations in the volume of liquid in said generator and expansion chamber for controlling the admission of liquid thereto.

15. In a steam generator, electric means for heating the liquid therein, an expansion chamber communicating with the liquid in said generator and affording an auxiliary chamber in which a variable amount of liquid is received in accordance with the pressure in said generator, and means responsive to variations in the liquid level in said generator and to variations in the volume of liquid in said generator and expansion chamber for controlling the admission of liquid thereto.

16. In a steam generator, electrodes at least partially immersed in the liquid therein under normal operating conditions, an expansion chamber communicating with the liquid in said generator and affording an auxiliary chamber in which a variable amount of liquid is received in accordance with the pressure in said generator, and means responsive to variations in the liquid level in said generator and to variations in the volume of liquid in said generator and expansion chamber for controlling the admission of liquid thereto.

1'7. In asteam generator, electrodes at least partially immersed in the liquid therein under normal operating conditions, a chamber in the Walls of which are expansible communicating with the liquid in said generator and afiording an auxiliary chamber in which a variable amount of liquid is received in accordance with the pressure in said generator, and means responsive to variations in the liquid level in said generator and to variations in the volume of liquid in said generator and expansion chamber for controlling the admission of liquid thereto.

18. In a vapor generator comprising electrical means for heating the liquid therein and having an auxiliary chamber associated therewith, means responsive to the vapor pressure therein for varying the volume of liquid in said generator and means responsive to variations in the total liquid volumes in said generator and chamber for controlling the admission of liquid thereto.

WILLIAM C. MASON.

CERTIFICATE OF CORRECTION.

Patent No. 2,024,467. December 17, 1935 WILLIAM C. MASON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, first column, line 13, for the numeral "52" read 22; page 4, second column, line 68, claim 8, after the comma and before the syllable "auto-" insert the words electrically operated means for heating the liquid therein; page 5, second column, line 40, claim 17, strike out the word "in"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of February, A. D. 1956.

Leslie Frazer (Seal) Acting Commissioner of Pat nt CERTIFICATE OF CORRECTION.

Patent No. 2,024,467 December 17, 1935.

WILLIAM C. MASON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, first column, line 13,, for the numeral "52" read 22; page 4, second column, line 68, claim 8, after the comma and before the syllable "auto-" insert the words electrically operated means for heating the liquid therein; page 5, second column, line 40, claim 17, strike out the Word "in"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

I Signed and sealed this 11th day of February, A. D. 1936.

Leslie Frazer (Seal) Acting commissioner of Pat nt 

